Modify the project to enforce the 10-pebbles rule: [2pts]

If at the end of a turn a player has more than 10 pebbles, the administrator must remove all the superfluous pebbles.

Also state and implement a contract that enforces this invariant. [1pt] Take a look at the suggested new interface and the revised sequence contract. [1pt] (How easy is it to change the state pattern version? How easy is it to change a checker that uses boolean variables?)

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Implement a human player. That is, implement a View for human players so that you and/or your friends can compete against the machine players. [5pts]